

video{
    width: 800px;
}


.body {
    height: 900px;
    min-height: 900px;
}

.head {
    overflow: hidden;
    margin-top: 10px;
    padding-left: 10px;
    padding-right: 10px;
}

.main {
    height: 100%;
}

.main_mid {
    height: 100%;
}

.main_left {
    float: left;
    width: 20%;
    background-color: white;
    border-radius: 5px;
    margin-top: 10px;
    height: 98%;

}

.main_right {
    overflow: hidden;
    background-color: white;
    padding: 20px;
    float: right;
    width: 79%;
    margin-top: 10px;
    border-radius: 5px;
    height: 98%;

}


.pptSpan{
    height:10px ;
    float: left;
    background-color: rgba(199,199,199,0.81);
}
.pptSpan:hover{
    background-color: rgba(16,142,233,0.81) !important;
}